Meaning of “straight” - Learner’s Dictionary

straight

adverb uk us /streɪt/
DIRECTION

A2 in a straight line:

It's straight ahead.
He was looking straight at me.
IMMEDIATELY

B1 immediately:

I went straight back to sleep.
sit up/stand up straight

B2 to sit or stand with your body vertical

not think straight

If you cannot think straight, you are not thinking clearly about something:

I was so tired, I couldn't think straight.
tell sb straight (out)

to tell someone the truth in a clear way:

I told him straight that he wasn't getting a pay increase.
straight away

B1 immediately:

Go there straight away.

(Definition of “straight adverb” from the Cambridge Learner’s Dictionary © Cambridge University Press)